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        // babel语法编译器
        //1.安装工具 babrl-cli babel-reeset-env browserify(webpack)

        // 2. npx babel src/js -d dist/js

        // 3.打包 npx browserify dist/js/app.js -o dist/bundle.js

        //引入文件时引入dist/bundle.js这个文件
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